Mac OS X

Twisted is no longer making a .dmg which creates a system installation for OS X because OS X versions 10.5 and greater ship with Twisted installed and the default Python path configuration makes it impossible for a user to upgrade Twisted without possibly breaking applications which depend on the system Twisted installation.

OS X users may want to install Twisted from the source tarball to a different location.

FreeBSD

Though Twisted is not fully functional or officially supported on FreeBSD (​but you can help!), packages of Twisted are available in FreeBSD ports as 'devel/py-twisted'. You can choose what component of Twisted you install using command 'make config'.